Question

A student states that an exothermic chemical reaction can transfer its heat only by convection and conduction. Which disproves this student's statement? Exothermic reactions often produce light.
Conduction cannot occur in a liquid.
Gases often rise from the surface of a reaction.
Convection currents form during chemical reactions.

Answer 1

b is the right answer

Answer 2

Answer: Option (b) is the correct answer.

Explanation:

A chemical reaction in which there is release of heat is known as an exothermic reaction. And a reaction in which heat is absorbed by reactant molecules is known as an endothermic reaction.

In conduction, two objects of different temperature are placed adjacent to each other. As a result, heat flows from hotter object to colder object.

Conduction occurs in solid substances.

On the other hand, in convection, when two fluids (liquid or gas) are heated together then molecules of more dense (colder) fluid sink at the bottom. Whereas molecules of less dense (hotter) fluid rises at the top.

Hence, we can conclude that the student's statement conduction cannot occur in a liquid, is disproved.